@bestsublimation: Heat Transfer Tips to Extend Your Heater’s Lifespan To extend the heater’s service life, we recommend selecting a heater sized to match your mugs or tumblers. Do not attempt to print two mugs simultaneously using a single long heater, this will cause blistering and wrinkling on the heating element, resulting in permanent damage. #heattransfer #sublimation #heatpress #tumblerheatpress